• Title, Summary, Keyword: infrared

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Far Infrared Rays Drying Characteristics of Tissue Cultured Mountain Ginseng Roots (산삼배양근의 원적외선 건조특성)

  • Li, H.;Kwang, T.H.;Ning, X.F.;Cho, S.C.;Han, C.S.
    • Journal of Biosystems Engineering
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    • v.34 no.3
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    • pp.175-182
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    • 2009
  • This study was conducted to investigate the drying characteristics of tissue cultured mountain ginseng roots. The far infrared rays dryer of a double blast system used for this experiment can control the drying parameters such as far infrared heater temperature and air velocity. The far infrared rays drying tests of tissue cultured mountain ginseng roots were performed at air velocity of 0.4, 0.6, 0.8 m/s, under drying air temperature of 50, 60, and $70^{circ}C$, respectively. The results were compared with one obtained by the heated air drying method. The drying characteristics such as drying rate, color, energy consumption, saponin components and antioxidant activities were analyzed. The results showed that the drying rate of far infrared rays drying was faster than that of heated air drying and due to high temperature of drying air and fast air velocity, the far infrared rays drying of double blast type was superior to the heated air drying. The value of the color difference for heated air drying was 10.11${\sim}$12.99 and that of far infrared rays drying was in the range of 7.05${\sim}$7.54, which was in the same drying condition, also energy consumption of far infrared rays drying was in the range of 3575${\sim}$6898 kJ/kg-water. At the same time, the antioxidant activities using far infrared rays drying were higher than those using heated air drying.

The analysis of the Effect the Minute Quantities of Infrared Rays that Were not Filtered by IR Cut-Off Filter has on Digital Images (IR Cut-Off Filter가 차단하지 못한 미량의 적외선이 디지털화상에 미치는 영향 분석)

  • Lee, Yong-Hwan;Park, Se-Won;Hong, Jung-Eui
    • The Journal of the Korea Contents Association
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    • v.11 no.5
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    • pp.205-215
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    • 2011
  • Films are sensitive to ultraviolet rays and in contrast, digital camera sensors are extremely sensitive to infrared rays due to the differences in spectral characteristics. As a result, all digital cameras that use CCD or CMOS are equipped with IR Cut-Off Filter on the overall sensor. Complete block out of infrared rays is ideal, but the actual experiment results showed that infrared rays were not being blocked out completely. Infrared permeability was also different for each camera. Therefore, this study aims to analyze the effect of the minute quantities of infrared rays, which get transmitted due to mechanical properties of IR Cut-Off Filters that are installed on digital cameras, on digital picture images. The results obtained by carrying out a comparative analysis of a UV Filter (infrared transmitting state) and a UV-IR Filter (infrared blocked out state) are as follows. It was confirmed that the minute quantities of infrared rays do affect dynamic range and resolution to some extent, despite the little or no difference in noise and color reproduction.

Heat Analysis of Welding-bead using Infrared Thermoimage Camera (적외선 열화상 카메라를 이용한 용접 비드의 열 해석)

  • Kim, Jae-Yeol;Shim, Jae-Gi;Yang, Dong-Jo;Yu, Sin
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.57-62
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    • 2000
  • Diagnosis or measurements using Infrared thermoimage hasn't been available. A quick diagnosis and thermal analysis can be possible when that kind of system is introduced to the investigation of each part. In this study, Infrared Camera, Thermovision 900 was used in order to investigate. Infrared Camera usually detects only Infrared wave from the light in order to illustrate the temperature distribution. Infrared diagnosis system can be applied to various field. Also, it is more effective to analyze temperature distribution on the welding parts during welding process. Especially, diagnosis using Infrared camera plays an important role on thermal analysis of Axle Casing Nut for Commercial Vehicles.

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THE ASTRO-F ALL SKY SURVEY

  • PEARSON CHRIS;LEE HYUNG MOK;TEAM ASTRO-F
    • Journal of The Korean Astronomical Society
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    • v.36 no.3
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    • pp.249-260
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    • 2003
  • ASTRO-F is the next generation Japanese infrared space mission of the Institute of Space and Astronautical Science. ASTRO-F will be dedicated to an All Sky Survey in the far-infrared in 4 bands from 50-200microns with 2 additional mid-infrared bands at 9microns and 20microns. This will be the first all sky survey in the infrared since the ground breaking IRAS mission almost 20 years ago and the first ever survey at 170microns. The All Sky Survey should detect 10's of millions of sources in the far-infrared bands most of which will be dusty luminous and ultra-luminous star forming galaxies, with as many as half lying at redshifts greater than unity. In this contribution, the ASTRO-F mission and its objectives are reviewed and many of the mission expectations are discussed.

On the Mural Paintings Detectedc by through the Infrared T.V.Camera at Josadang, Busuk Temple (부석사 조사당 벽화조사에 따른 적외선 T.V카메라 이용)

  • Chung, Kwang-Yong
    • 보존과학연구
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    • pp.218-236
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    • 1986
  • In the fields of the cultural properties, the Infrared TV camera is being initiated to use instead of the Infrared photo film fo a better means to detect the description of drawings of the paintings. Seeing from the effect of transillumination, the Infrared TV camera with its long wave of visible spectrum that makes less absorption by the pigments and with the reflection rays passing through the base of colour layers makes it able to findbase drawing and letters. The detection range of transillumination by the infrared rays depends on the kinds of pigments, lines of the base drawing and wave length of the infrared rays. In our country, it was the first time to detect by our Conservation Science Dep't of The Research Institute of Cultural Properties by means of using Infrared TV camera to determine the mural paintings on the Josadang, Busuk Temple, resulted in an epoch-making success, that we have come to know the painting technique methods, how to treat for its conservation and making replica, reproduction, etc.

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Realization of Optic Systems for the Infrared Thermography (적외선 체열촬영시스템을 위한 광학계의 구성)

  • Lee, Soo-Yeol;Woo, Eung-Je;Cho, Min-Hyoung
    • Journal of Biomedical Engineering Research
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    • v.15 no.1
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    • pp.97-104
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    • 1994
  • In the conventional infrared imaging system, complex infrared lens systems are usually used for directing collimated narrow infrared beams into the high speed 2-dimensional optic scanner. In this paper, a simple reflective infrared optic system with a 2-dimensionaloptic scanner is proposed for the realization of medical infrared thermography system. It has been experimentally proven that the infrared thermography system composed ofthe proposed optic system has the temperature resolution of $0.1{\circ}C$ under the spatial resolution of 1mrad, the image matrix size of $256{\times}240$, and the imaging time of 4 seconds.

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Preparation and Characterization of Low Infrared Emissivity Bicomponent Fibers with Radar Absorbing Property (레이더 흡수특성이 있는 저적외선 방출 복합섬유의 제조 및 특성 연구)

  • Yu Bin;Qi Lu
    • Polymer Korea
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    • v.30 no.2
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    • pp.124-128
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    • 2006
  • Heavy weight of the camouflage materials was always the main problem. To solve it, the low infrared emissivity fibers with the radar absorbing property (LIFR) were prepared. The low infrared emissivity fibers (LIF) were firstly melt-spun by co-extrusion of polypropylene (PP) and PP/various fillers master-batches using general conjugate spinning. The infrared emissivity of LW with AA and ZnO was decreased respectively compared with that of pure polypropylene fibers. The infrared emissivity of LIF with 15 wt% Al and 2 wt% ZnO in the sheath-part can reach 0.58. To improve LIF radar absorbing property, LIFR was prepared by filling the 50 wt% ferrite and bronze in the core-part of LIF. The radar absorbing efficacy of LIFR was good and the infrared emissivity was low. For the characterization, fiber electron intensity instrument and differential scanning calorimetry (DSC) were used for the analysis of mechanical properties, thermal and crystallization behavior of the spun-fibers. Scanning electron microscopy (SEM) was carried out to observe the particle distribution of the bicomponent fibers.

A Study on Performance Test Methods for Cooled Infrared Detector (냉각형 적외선 검출기 성능평가 기술 연구)

  • Kim, Jae-Won
    • Journal of the Korea Institute of Military Science and Technology
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    • v.13 no.4
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    • pp.542-550
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    • 2010
  • Cooled infrared detector is widely used as the core part in a variety of the thermal imaging systems. For the selection of the highly reliable cooled infrared detector with good performance, it is necessary for us to possess the characterization methods of the well defined performance index of cooled infrared detector. In this paper, various performance index of the cooled infrared detector including reliability as well as the optical and cooling performance of cooled infrared detector are defined and their characterization methods will be investigated and implemented systematically.

A Practical FastSLAM Implementation Method using an Infrared Camera for Indoor Environments (실내 환경에서 Infrared 카메라를 이용한 실용적 FastSLAM 구현 방법)

  • Zhang, Hairong;Lee, Heon-Cheol;Lee, Beom-Hee
    • The Journal of Korea Robotics Society
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    • v.4 no.4
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    • pp.305-311
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    • 2009
  • FastSLAM is a factored solution to SLAM problem using a Rao-Blackwellized particle filter. In this paper, we propose a practical FastSLAM implementation method using an infrared camera for indoor environments. The infrared camera is equipped on a Pioneer3 robot and looks upward direction to the ceiling which has infrared tags with the same height. The infrared tags are detected with theinfrared camera as measurements, and the Nearest Neighbor method is used to solve the unknown data association problem. The global map is successfully built and the robot pose is predicted in real time by the FastSLAM2.0 algorithm. The experiment result shows the accuracy and robustness of the proposed method in practical indoor environment.

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